/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.core.namedparam;

import java.sql.PreparedStatement;
import java.sql.SQLException;

import org.springframework.jdbc.core.BatchPreparedStatementSetter;
import org.springframework.jdbc.core.BatchUpdateUtils;
import org.springframework.jdbc.core.JdbcOperations;

/**
 * Generic utility methods for working with JDBC batch statements using named parameters.
 * Mainly for internal use within the framework.
 *
 * @author Thomas Risberg
 * @since 3.0
 */
public abstract class NamedParameterBatchUpdateUtils extends BatchUpdateUtils {

    public static int[] executeBatchUpdateWithNamedParameters(final ParsedSql parsedSql,
                                                              final SqlParameterSource[] batchArgs, JdbcOperations jdbcOperations) {

        if (batchArgs.length <= 0) {
            return new int[]{0};
        }

        String sqlToUse = NamedParameterUtils.substituteNamedParameters(parsedSql, batchArgs[0]);
        return jdbcOperations.batchUpdate(
                sqlToUse,
                new BatchPreparedStatementSetter() {
                    @Override
                    public void setValues(PreparedStatement ps, int i) throws SQLException {
                        Object[] values = NamedParameterUtils.buildValueArray(parsedSql, batchArgs[i], null);
                        int[] columnTypes = NamedParameterUtils.buildSqlTypeArray(parsedSql, batchArgs[i]);
                        setStatementParameters(values, ps, columnTypes);
                    }

                    @Override
                    public int getBatchSize() {
                        return batchArgs.length;
                    }
                });
    }

}
